US4729350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve clearance compensation apparatus for internal combustion engines
Assignee: Motomak Motorenbau Maschinen und Werkzeugfabrik Konstruktionen GmbH
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Filing: 1987-03-26
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Granted: 1988-03-08
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Expires: 2007-03-26
Abstract
Abstract A hydraulic valve clearance compensation apparatus for internal combustionngines comprising a hydraulic compensation element accommodated in a bore of a rocker arm or actuating element which bore extends in prolongation of the stem of a motor valve and having a piston element guided for longitudinal displacement and provided with a crowned projection at its end facing the valve stem wherein a guide shoe is arranged between the crowned projection and the flat end face of the valve stem which, on the one hand, includes a spherical indentation engaged by the crowned projection of the piston element and, on the other hand, has a flat surface supported by the end face of the valve stem wherein the guide shoe is securely mounted to the valve stem, characterized in that a cage element (13) is arranged at the valve stem (4) or at an element (b 7,8) connected to the latter, the cage element (13) extending in direction to the piston element (3) and ends in radially inwardly directed restraining zones (15,19,23) which encompass the outer surface of the guide shoe (9) or projection (12) of this outer surface so that the guide shoe (9) is freely displaceable in the transverse direction relative to the valve stem (4) but is stil securely mounted thereto.
Inventors
- 👤 Walter Speil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:37
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/18; F01L1/181; F01L1/20; F01L1/22; F01L1/24; F01L1/2411; F01L1/46; F01L3/00; F01L3/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
212 words
A hydraulic valve clearance compensation apparatus for internal combustion engines comprising a hydraulic compensation element accommodated in a bore of a rocker arm or actuating element which bore extends in prolongation of the stem of a motor valve and having a piston element guided for longitudinal displacement and provided with a crowned projection at its end facing the valve stem wherein a guide shoe is arranged between the crowned projection and the flat end face of the valve stem which, on the one hand, includes a spherical indentation engaged by the crowned projection of the piston element and, on the other hand, has a flat surface supported by the end face of the valve stem wherein the guide shoe is securely mounted to the valve stem, characterized in that a cage element (13) is arranged at the valve stem (4) or at an element (7,8) connected to the latter, the cage element (13) extending in direction to the piston element (3) and ends in radially inwardly directed restraining zones (15,19,23) which encompass the outer surface of the guide shoe (9) or projections (12) of this outer surface so that the guide shoe (9) is freely displaceable in the transverse direction relative to the valve stem (4) but is still securely mounted thereto.
Claim 2
Dependent Claim
212 words
A hydraulic valve clearance compensation apparatus for internal combustion engines comprising a hydraulic compensation element accommodated in a bore of a rocker arm or actuating element which bore extends in prolongation of the stem of a motor valve and having a piston element guided for longitudinal displacement and provided with a crowned projection at its end facing the valve stem wherein a guide shoe is arranged between the crowned projection and the flat end face of the valve stem which, on the one hand, includes a spherical indentation engaged by the crowned projection of the piston element and, on the other hand, has a flat surface supported by the end face of the valve stem wherein the guide shoe is securely mounted to the valve stem, characterized in that a cage element (13) is arranged at the valve stem (4) or at an element (7,8) connected to the latter, the cage element (13) extending in direction to the piston element (3) and ends in radially inwardly directed restraining zones (15,19,23) which encompass the outer surface of the guide shoe (9) or projections (12) of this outer surface so that the guide shoe (9) is freely displaceable in the transverse direction relative to the valve stem (4) but is still securely mounted thereto.
Claim 3
Dependent Claim
66 words
A valve clearance compensation apparatus of claim 1, characterized in that the cage element (13) includes a cylindrical collar (14,18,20,22,24) whose inner diameter is greater than the greatest outer diameter of the guide shoe (9) and has radially inwardly directed restraining zones (15,19,23) provided at its end facing the piston element (3) and encompassing the greatest outer diameter of the guide shoe (9) with axial clearance.
Claim 4
Dependent Claim
52 words
A valve clearance compensation apparatus of claim 2, characterized in that the cylindrical collar (14) is provided at its end facing the valve stem (4) with a radial flange (16) which is connected to a hollow cylindrical element (17) placed on the valve stem end (4) in a force-locking or form-fitting manner.
Claim 5
Dependent Claim
38 words
A valve clearance compensation apparatus of claim 2, characterized in that the cylindrical collar (22,24) is part of a spring plate (7) fixed in a form-fitting manner to the valve stem (4) by means of valve keys (8).
Claim 6
Dependent Claim
27 words
A valve clearance compensation apparatus of claim 2, characterized in that the cylindrical collar (18,20) consists of individual segments which are part of the valve keys (8).
Claim 7
Dependent Claim
24 words
A valve clearance compensation apparatus of claim 4 characterized in that the cylindrical collar (14,28,22) is provided with restraining zones (15,19,23) integrally connected thereto.
Claim 8
Dependent Claim
24 words
A valve clearance compensation apparatus of claim 5 characterized in that the cylindrical collar (14,28,22) is provided with restraining zones (15,19,23) integrally connected thereto.
Claim 9
Dependent Claim
36 words
A Valve clearance compensation apparatus of claim 4 characterized in that the restraining zones are defined by a sheet metal flange (21,25) which is fixed to the cylindrical collar (20,24) in a force-locking or form-fitting manner.
Claim 10
Dependent Claim
36 words
A valve clearance compensation apparatus of claim 5 characterized in that the restraining zones are defined by a sheet metal flange (21,25) which is fixed to the cylindrical collar (20,24) in a force-locking or form-fitting manner.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |